Java读取邮件

一、配置 smtp协议可以用来发送邮件，IMAP协议可以用来读取邮件。QQ邮箱设置中开启POP3协议。发送邮件javaMail-发送邮件 二、代码实现 参看了一篇几年前的博客，拿过来进行了一些改造，只是一个基版，一些邮箱的东西什么可以放到配置文件中，因暂时没有需求，暂时这样，记录一下，用到在进行升级改造。（POP3是双向的，如果你要进行删除操作，邮件服务器上也会删除邮件）java代码网上博客很多了，这两天拿来研究一下，做个笔记

import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Value; import javax.mail.*; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import javax.mail.internet.MimeMultipart; import javax.mail.internet.MimeUtility; import java.io.*; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Properties; /** * 使用POP3协议解析邮件帮助类 * * @author bzs on 2018/6/28. */ @Slf4j public class ParsingEmailUtil { public static void main(String[] args) throws Exception{ resceive("**********@163.com", "*****"); } /** * 获取邮箱信息 * * @param emailAdress 需要解析的邮箱地址 * @param password 邮箱的授权密码 * @throws Exception */ public static void resceive(String emailAdress, String password) throws Exception { String port = "110"; // 端口号 String servicePath = "pop.163.com"; // 服务器地址 // 准备连接服务器的会话信息 Properties props = new Properties(); props.setProperty("mail.store.protocol", "pop3"); // 使用pop3协议 props.setProperty("mail.pop3.port", port); // 端口 props.setProperty("mail.pop3.host", servicePath); // pop3服务器 // 创建Session实例对象 Session session = Session.getInstance(props); Store store = session.getStore("pop3"); store.connect(emailAdress, password); //163邮箱程序登录属于第三方登录所以这里的密码是163给的授权密码而并非普通的登录密码 // 获得收件箱 Folder folder = store.getFolder("INBOX"); /* Folder.READ_ONLY：只读权限 * Folder.READ_WRITE：可读可写（可以修改邮件的状态） */ folder.open(Folder.READ_WRITE); //打开收件箱 // // 由于POP3协议无法获知邮件的状态,所以getUnreadMessageCount得到的是收件箱的邮件总数 // System.out.println("未读邮件数: " + folder.getUnreadMessageCount()); // // // 由于POP3协议无法获知邮件的状态,所以下面得到的结果始终都是为0 // System.out.println("删除邮件数: " + folder.getDeletedMessageCount()); // System.out.println("新邮件: " + folder.getNewMessageCount()); // 获得收件箱中的邮件总数 log.warn("邮件总数: {}", folder.getMessageCount()); // 得到收件箱中的所有邮件,并解析 Message[] messages = folder.getMessages(); //解析邮件 parseMessage(messages); //得到收件箱中的所有邮件并且删除邮件 // deleteMessage(messages); //释放资源 folder.close(true); store.close(); } /** * 解析邮件 * * @param messages 要解析的邮件列表 */ public static void parseMessage(Message... messages) throws MessagingException, IOException { if (messages == null || messages.length < 1) throw new MessagingException("未找到要解析的邮件!"); // 解析所有邮件 for (int i = 0, count = messages.length; i < count; i++) { MimeMessage msg = (MimeMessage) messages[i]; log.info("------------------解析第" + msg.getMessageNumber() + "封邮件-------------------- "); log.warn("主题: {}" , getSubject(msg)); log.warn("发件人: {}" , getFrom(msg)); log.warn("收件人：{}" , getReceiveAddress(msg, null)); log.warn("发送时间：{}" , getSentDate(msg, null)); log.warn("是否已读：{}" , isSeen(msg)); log.warn("邮件优先级：{}" , getPriority(msg)); log.warn("是否需要回执：{}" , isReplySign(msg)); log.warn("邮件大小：{}" , msg.getSize() * 1024 + "kb"); boolean isContainerAttachment = isContainAttachment(msg); log.warn("是否包含附件：{}" ,isContainerAttachment); if (isContainerAttachment) { saveAttachment(msg, "d:\\log\\" + msg.getSubject() + "_" + i + "_"); //保存附件 } StringBuffer content = new StringBuffer(30); //解析邮件正文 getMailTextContent(msg, content); log.warn("邮件正文：{}" , content); log.info("------------------第" + msg.getMessageNumber() + "封邮件解析结束-------------------- "); System.out.println(); } } /** * 删除邮件 * * @param messages 要删除邮件列表 */ public static void deleteMessage(Message... messages) throws MessagingException, IOException { if (messages == null || messages.length < 1) throw new MessagingException("未找到要解析的邮件!"); // 解析所有邮件 for (int i = 0, count = messages.length; i < count; i++) { /** * 邮件删除 */ Message message = messages[i]; String subject = message.getSubject(); // set the DELETE flag to true message.setFlag(Flags.Flag.DELETED, true); System.out.println("Marked DELETE for message: " + subject); } } /** * 获得邮件主题 * * @param msg 邮件内容 * @return 解码后的邮件主题 */ public static String getSubject(MimeMessage msg) throws UnsupportedEncodingException, MessagingException { return MimeUtility.decodeText(msg.getSubject()); } /** * 获得邮件发件人 * * @param msg 邮件内容 * @return 姓名 <Email地址> * @throws MessagingException * @throws UnsupportedEncodingException */ public static String getFrom(MimeMessage msg) throws MessagingException, UnsupportedEncodingException { String from = ""; Address[] froms = msg.getFrom(); if (froms.length < 1) throw new MessagingException("没有发件人!"); InternetAddress address = (InternetAddress) froms[0]; String person = address.getPersonal(); if (person != null) { person = MimeUtility.decodeText(person) + " "; } else { person = ""; } from = person + "<" + address.getAddress() + ">"; return from; } /** * 根据收件人类型，获取邮件收件人、抄送和密送地址。如果收件人类型为空，则获得所有的收件人 * <p>Message.RecipientType.TO 收件人</p> * <p>Message.RecipientType.CC 抄送</p> * <p>Message.RecipientType.BCC 密送</p> * * @param msg 邮件内容 * @param type 收件人类型 * @return 收件人1 <邮件地址1>, 收件人2 <邮件地址2>, ... * @throws MessagingException */ public static String getReceiveAddress(MimeMessage msg, Message.RecipientType type) throws MessagingException { StringBuffer receiveAddress = new StringBuffer(); Address[] addresss = null; if (type == null) { addresss = msg.getAllRecipients(); } else { addresss = msg.getRecipients(type); } if (addresss == null || addresss.length < 1) throw new MessagingException("没有收件人!"); for (Address address : addresss) { InternetAddress internetAddress = (InternetAddress) address; receiveAddress.append(internetAddress.toUnicodeString()).append(","); } receiveAddress.deleteCharAt(receiveAddress.length() - 1); //删除最后一个逗号 return receiveAddress.toString(); } /** * 获得邮件发送时间 * * @param msg 邮件内容 * @return yyyy年mm月dd日 星期X HH:mm * @throws MessagingException */ public static String getSentDate(MimeMessage msg, String pattern) throws MessagingException { Date receivedDate = msg.getSentDate(); if (receivedDate == null) return ""; if (pattern == null || "".equals(pattern)) pattern = "yyyy年MM月dd日 E HH:mm "; return new SimpleDateFormat(pattern).format(receivedDate); } /** * 判断邮件中是否包含附件 * * @param part 邮件内容 * @return 邮件中存在附件返回true，不存在返回false * @throws MessagingException * @throws IOException */ public static boolean isContainAttachment(Part part) throws MessagingException, IOException { boolean flag = false; if (part.isMimeType("multipart/*")) { MimeMultipart multipart = (MimeMultipart) part.getContent(); int partCount = multipart.getCount(); for (int i = 0; i < partCount; i++) { BodyPart bodyPart = multipart.getBodyPart(i); String disp = bodyPart.getDisposition(); if (disp != null && (disp.equalsIgnoreCase(Part.ATTACHMENT) || disp.equalsIgnoreCase(Part.INLINE))) { flag = true; } else if (bodyPart.isMimeType("multipart/*")) { flag = isContainAttachment(bodyPart); } else { String contentType = bodyPart.getContentType(); if (contentType.indexOf("application") != -1) { flag = true; } if (contentType.indexOf("name") != -1) { flag = true; } } if (flag) break; } } else if (part.isMimeType("message/rfc822")) { flag = isContainAttachment((Part) part.getContent()); } return flag; } /** * 判断邮件是否已读 * * @param msg 邮件内容 * @return 如果邮件已读返回true, 否则返回false * @throws MessagingException */ public static boolean isSeen(MimeMessage msg) throws MessagingException { return msg.getFlags().contains(Flags.Flag.SEEN); } /** * 判断邮件是否需要阅读回执 * * @param msg 邮件内容 * @return 需要回执返回true, 否则返回false * @throws MessagingException */ public static boolean isReplySign(MimeMessage msg) throws MessagingException { boolean replySign = false; String[] headers = msg.getHeader("Disposition-Notification-To"); if (headers != null) replySign = true; return replySign; } /** * 获得邮件的优先级 * * @param msg 邮件内容 * @return 1(High):紧急 3:普通(Normal) 5:低(Low) * @throws MessagingException */ public static String getPriority(MimeMessage msg) throws MessagingException { String priority = "普通"; String[] headers = msg.getHeader("X-Priority"); if (headers != null) { String headerPriority = headers[0]; if (headerPriority.indexOf("1") != -1 || headerPriority.indexOf("High") != -1) priority = "紧急"; else if (headerPriority.indexOf("5") != -1 || headerPriority.indexOf("Low") != -1) priority = "低"; else priority = "普通"; } return priority; } /** * 获得邮件文本内容 * * @param part 邮件体 * @param content 存储邮件文本内容的字符串 * @throws MessagingException * @throws IOException */ public static void getMailTextContent(Part part, StringBuffer content) throws MessagingException, IOException { //如果是文本类型的附件，通过getContent方法可以取到文本内容，但这不是我们需要的结果，所以在这里要做判断 boolean isContainTextAttach = part.getContentType().indexOf("name") > 0; if (part.isMimeType("text/*") && !isContainTextAttach) { content.append(part.getContent().toString()); } else if (part.isMimeType("message/rfc822")) { getMailTextContent((Part) part.getContent(), content); } else if (part.isMimeType("multipart/*")) { Multipart multipart = (Multipart) part.getContent(); int partCount = multipart.getCount(); for (int i = 0; i < partCount; i++) { BodyPart bodyPart = multipart.getBodyPart(i); getMailTextContent(bodyPart, content); } } } /** * 保存附件 * * @param part 邮件中多个组合体中的其中一个组合体 * @param destDir 附件保存目录 * @throws UnsupportedEncodingException * @throws MessagingException * @throws FileNotFoundException * @throws IOException */ public static void saveAttachment(Part part, String destDir) throws MessagingException, IOException { if (part.isMimeType("multipart/*")) { Multipart multipart = (Multipart) part.getContent(); //复杂体邮件 //复杂体邮件包含多个邮件体 int partCount = multipart.getCount(); for (int i = 0; i < partCount; i++) { //获得复杂体邮件中其中一个邮件体 BodyPart bodyPart = multipart.getBodyPart(i); //某一个邮件体也有可能是由多个邮件体组成的复杂体 String disp = bodyPart.getDisposition(); if (disp != null && (disp.equalsIgnoreCase(Part.ATTACHMENT) || disp.equalsIgnoreCase(Part.INLINE))) { InputStream is = bodyPart.getInputStream(); saveFile(is, destDir, decodeText(bodyPart.getFileName())); } else if (bodyPart.isMimeType("multipart/*")) { saveAttachment(bodyPart, destDir); } else { String contentType = bodyPart.getContentType(); if (contentType.indexOf("name") != -1 || contentType.indexOf("application") != -1) { saveFile(bodyPart.getInputStream(), destDir, decodeText(bodyPart.getFileName())); } } } } else if (part.isMimeType("message/rfc822")) { saveAttachment((Part) part.getContent(), destDir); } } /** * 读取输入流中的数据保存至指定目录 * * @param is 输入流 * @param fileName 文件名 * @param destDir 文件存储目录 * @throws FileNotFoundException * @throws IOException */ private static void saveFile(InputStream is, String destDir, String fileName) throws FileNotFoundException, IOException { BufferedInputStream bis = new BufferedInputStream(is); BufferedOutputStream bos = new BufferedOutputStream( new FileOutputStream(new File(destDir + fileName))); int len = -1; while ((len = bis.read()) != -1) { bos.write(len); bos.flush(); } bos.close(); bis.close(); } /** * 文本解码 * * @param encodeText 解码MimeUtility.encodeText(String text)方法编码后的文本 * @return 解码后的文本 * @throws UnsupportedEncodingException */ public static String decodeText(String encodeText) throws UnsupportedEncodingException { if (encodeText == null || "".equals(encodeText)) { return ""; } else { return MimeUtility.decodeText(encodeText); } } } public void readMail(){ try { // 1. 设置连接信息, 生成一个 Session Properties props = new Properties(); // 用空的 Properties也行这里 props.setProperty("mail.smtp.host", "smtp.qq.com"); props.setProperty("mail.smtp.auth", "true"); // 解决邮件下载慢的问题，因为我邮件下载速度很快，所以没有验证这段代码 //props.setProperty("mail.imap.partialfetch", "false"); //props.setProperty("mail.imaps.partialfetch", "false"); Session session = Session.getDefaultInstance(props); // 2. 获取 Store 并连接到服务器 // 设置连接相关信息，file 可以直接指定邮箱的某个文件夹 // 邮件在邮件服务器上是在每个用户名下，设置不同的文件，收件箱默认为“INBOX” // URLName urlname = new URLName("pop3","pop.qq.com",110,"INBOX","youremail@foxmail.com","你的授权码"); URLName urlname = new URLName("pop3","pop.qq.com",110,null,"youremil@foxmail.com","授权码"); Store store = session.getStore(urlname); store.connect(); // 默认父目录 Folder folder = store.getDefaultFolder(); if (folder == null) { System.out.println("服务器不可用"); return; } String defaultFolderName = folder.getName(); System.out.println("默认信箱名:" + defaultFolderName); // 默认目录列表 Folder[] folders = folder.list(); System.out.println("默认目录下的子目录数: " + folders.length); System.out.println("-----根目录下的包含的文件名-----"); for(int i = 0; i < folders.length; i++) { System.out.println("【目录下的文件名】：【" + folders[i].getFullName() + "】"); } System.out.println("---------------"); // 获取收件箱 Folder popFolder = folder.getFolder("INBOX"); // 可读邮件,可以删邮件的模式打开目录 popFolder.open(Folder.HOLDS_FOLDERS); // 4. 列出来收件箱 下所有邮件 Message[] messages = popFolder.getMessages(); // 取出来邮件数 int msgCount = popFolder.getMessageCount(); System.out.println("共有邮件: " + msgCount + "封"); // FetchProfile fProfile = new FetchProfile();// 选择邮件的下载模式, // 根据网速选择不同的模式 // fProfile.add(FetchProfile.Item.ENVELOPE); // folder.fetch(messages, fProfile);// 选择性的下载邮件 // 5. 循环处理每个邮件并实现邮件转为新闻的功能 for (int i = 0; i < msgCount; i++) { // 单个邮件 System.out.println("第" + i +"封邮件开始"); mailReceiver(messages[i]); System.out.println("第" + i +"封邮件结束"); //邮件读取用来校验 messages[i].writeTo(new FileOutputStream("D:/pop3MailReceiver"+ i +".eml")); } // 7. 关闭 Folder 会真正删除邮件, false 不删除 popFolder.close(false); // 8. 关闭 store, 断开网络连接 store.close(); } catch (Exception e) { e.printStackTrace(); } } /** * 解析邮件 */ private void mailReceiver(Message msg)throws Exception{ System.out.println("【邮件ID】:【" + msg.getMessageNumber() + "】"); System.out.println("【邮件主题】:【" + MimeUtility.decodeText(msg.getSubject()) + "】"); System.out.println("【邮件发送时间】:【" + this.getSentDate(msg) + "】"); // 发件人信息 Address[] froms = msg.getFrom(); if(froms != null) { InternetAddress addr = (InternetAddress)froms[0]; System.out.println("【发件人地址】:【" + addr.getAddress() + "】"); System.out.println("【发件人显示名】:【" + addr.getPersonal() + "】"); } // System.out.println("【收件人】:【" + msg.getRecipients(Message.RecipientType.TO) + "】"); System.out.println("【是否需要回复】:【" + this.needReplyState(msg) + "】"); System.out.println("【是否需要回复】:【" + this.isNew(msg) + "】"); // getContent() 是获取包裹内容, Part相当于外包装 Object o = msg.getContent(); if(o instanceof Multipart) { Multipart multipart = (Multipart) o ; reMultipart(multipart); } else if (o instanceof Part){ Part part = (Part) o; rePart(part); } else { System.out.println("【邮件内容类型】:【" + msg.getContentType() + "】"); System.out.println("【内容】:【" + msg.getContent() + "】"); } } /** * @param part 解析内容 * @throws Exception */ private void rePart(Part part) throws MessagingException, IOException { if (part.getDisposition() != null) { String strFileNmae = MimeUtility.decodeText(part.getFileName()); //MimeUtility.decodeText解决附件名乱码问题 System.out.println("【发现附件】:【 " + MimeUtility.decodeText(part.getFileName()) + "】"); System.out.println("【内容类型】:【 " + MimeUtility.decodeText(part.getContentType()) + "】"); System.out.println("【附件内容】:【" + part.getContent() + "】"); InputStream in = part.getInputStream(); // 打开附件的输入流 // 读取附件字节并存储到文件中 java.io.FileOutputStream out = new FileOutputStream(strFileNmae); int data; while((data = in.read()) != -1) { out.write(data); } in.close(); out.close(); } /*else { if(part.getContentType().startsWith("text/plain")) { System.out.println("文本内容：" + part.getContent()); } else { //System.out.println("HTML内容：" + part.getContent()); } }*/ } /** * @param multipart // 接卸包裹（含所有邮件内容(包裹+正文+附件)） * @throws Exception */ private void reMultipart(Multipart multipart) throws Exception { //System.out.println("邮件共有" + multipart.getCount() + "部分组成"); // 依次处理各个部分 for (int j = 0, n = multipart.getCount(); j < n; j++) { //System.out.println("处理第" + j + "部分"); Part part = multipart.getBodyPart(j);//解包, 取出 MultiPart的各个部分, 每部分可能是邮件内容, // 也可能是另一个小包裹(MultipPart) // 判断此包裹内容是不是一个小包裹, 一般这一部分是 正文 Content-Type: multipart/alternative if (part.getContent() instanceof Multipart) { Multipart p = (Multipart) part.getContent();// 转成小包裹 //递归迭代 reMultipart(p); } else { rePart(part); } } } /** *获取邮件日期 */ private String getSentDate(Message message){ String emailSendDate = "邮件发送的时间出错"; try { Date date = message.getSentDate(); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); emailSendDate = format.format(date); } catch (MessagingException e) { e.printStackTrace(); } return emailSendDate; } public String needReplyState(Message message) throws MessagingException { String replyFlag = "此邮件不需要回复"; String [] needReply = message.getHeader("Disposition-Notification-To"); if (null != needReply){ replyFlag = "邮件需要回复"; } return replyFlag; } public String isNew(Message message) throws MessagingException { Flags flags = message.getFlags(); Flags.Flag[] flag = flags.getSystemFlags(); for (int i = 0; i<flag.length;i++){ if (Flags.Flag.SEEN == flag[i]){ return "邮件未读"; } } return "邮件已读"; } /** * @param args */ public static void main(String[] args) { MailUtil mailUtil = new MailUtil(); mailUtil.readMail(); }